CARFAX and AutoCheck are the two best-known vehicle history services in North America. Both generate a report by VIN, but they use different data sources, so the results can differ. Here is what each report shows and how to read them together.
Short answer
CARFAX and AutoCheck gather information from insurance companies, auctions, service stations, registration authorities, and law enforcement agencies in the USA and Canada. Reports can show mileage, registered accidents, maintenance, ownership changes, and auction records, but the data included depends on which organizations reported information to that particular database. Neither report guarantees a complete history — it should be cross-checked against photos, documents, and, where possible, a physical inspection.
Data sources
Neither service performs its own vehicle diagnostics — both aggregate records from partners: insurance companies, auctions, dealers, service centers, state registration authorities, and law enforcement bodies. If an organization does not report data to a particular database, an event may not appear in the report regardless of whether it actually happened.
What the report can show
- mileage history based on odometer readings at different stages;
- registered accidents and insurance claims;
- maintenance records;
- the number and registration region of previous owners;
- use as a taxi, rental, or in a commercial fleet;
- title status — clean, salvage, rebuilt, flood, and others;
- auction sale records;
- open manufacturer recall campaigns.
How CARFAX and AutoCheck differ
The two services' sets of sources do not fully overlap, so one report may show an event that is missing from the other. AutoCheck separately calculates a history score using its own methodology, which is not equivalent to a direct comparison with CARFAX. A discrepancy between reports does not automatically mean one of them is wrong — it is a consequence of different sources.
Mileage
Both reports can show the sequence of odometer readings. A gap in the sequence, a "does not match" flag, or missing data over a long period is a reason for further checking, not conclusive proof of odometer rollback.
Accidents and insurance claims
Reports show only the cases that the data sources became aware of. Minor repairs paid in cash, repairs made without involving insurance, or an accident in a jurisdiction with limited data sharing may not show up in the history.
Maintenance
Records from service stations and dealers do not always make it into the report — independent shops and maintenance outside the official network report data less often. The absence of maintenance records does not mean maintenance never happened.
Auction records
Reports can show that a vehicle was sold at auction and sometimes the declared damage. It is useful to compare this with the current listing: a resale without repair, or with a different damage description, is a signal for closer scrutiny.
Gaps in the history
Periods without records, a change of registration state shortly before the sale, or a lack of usage data are not proof of a problem, but they are grounds to ask the seller or broker additional questions and look for other sources: photos, documents, previous listings.
Limitations
Neither CARFAX nor AutoCheck replaces a physical inspection and technical diagnostics. They do not confirm the condition of the engine, transmission, electronics, or hidden body elements as of the purchase date.
Checklist for matching the report to the lot
| Check | Why |
|---|---|
| VIN in the report and in the listing | Rule out an identification error |
| Declared damage in the listing and in the report | Spot discrepancies in the description |
| Mileage sequence | Detect gaps or inconsistencies |
| Title status in the report and in the document | Confirm the status matches |
| Auction records of prior sales | Spot a resale without repair |
| Registration and usage dates | Assess the plausibility of the history |
Frequently asked questions
Which report is more accurate?
There is no universal answer — the sources differ in part, so for an important purchase it is useful to order and compare both reports.
If the report is "clean," can the photos be skipped?
No. A clean report means no events were recorded in the available sources, not a confirmed absence of damage.
Does the report show hidden damage after an accident that was not reported to insurance?
Generally no — if the event was not reported to the data sources, it will not appear in the report.
Can you get a report by VIN for a European vehicle?
CARFAX and AutoCheck are geared toward the North American market, so other sources are used for Europe — registration documents and service history.
Is a history report needed if the vehicle has already been physically inspected?
The report complements the inspection with information that cannot be seen visually: mileage, registrations, maintenance — combining methods is more reliable than either one alone.
Next step
Use the history report together with the methodology for checking documents and photos — more in the article "How to choose a Copart lot" and on the VIN vehicle-check page.
